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| Description: Importation inference. (The proof was shortened by Eric Schmidt, 22-Dec-2006.) |
| Ref | Expression |
|---|---|
| imp.1 |
|
| Ref | Expression |
|---|---|
| imp |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | imp.1 |
. 2
| |
| 2 | impexp 347 |
. 2
| |
| 3 | 1, 2 | mpbir 190 |
1
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